<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片试图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
       <el-tabs v-model="activeName" @tab-click="handleTabClick">
         <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染Tag标签 -->
                  <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                  <!-- 输入的文本框 -->
                  <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table> 
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染Tag标签 -->
                  <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                  <!-- 输入的文本框 -->
                  <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)" >删除</el-button>
                </template>
              </el-table-column>
            </el-table> 
        </el-tab-pane>

      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return{
        catelist: [],
        cateProps: {
          expandTrigger: "hover" ,
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        selectedCateKeys: [],
        // 被激活的页签名称
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态属性的数据
        onlyTableData: [],
         // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {},
        // 修改表单的验证规则对象
        editFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        }
      }
    },
    created() {
      this.getCateList()
    },
    computed: {
      // 如果按钮需要被禁用  则返回true，否则false
      isBtnDisabled() {
        if(this.selectedCateKeys.length !== 3) {
          return true
        } 
        return false
      },
      // 当前选中的三级分类的Id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      titleText() {
        if(this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        this.catelist = res.data
      },
      handleChange() {
        this.getParamsData()
      },
      // 获取参数的列表数据
      async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }

        // 证明选中的是三级分类
        console.log(this.selectedCateKeys)
        // 根据所选分类的Id，和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }

        res.data.forEach(item => {
          // 判断字符串是否是空的
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''
        })

        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      handleTabClick() {
        this.getParamsData()
      },
      //添加对话框的关闭
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 添加参数对话框确定
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) return
          const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }) 
          if(res.meta.status !== 201) {
            return this.$message.error('失败')
          }
          this.$message.success('成功')
          this.addDialogVisible = false
          this.getParamsData()
          })
      },
      // 点击按钮展示修改对话框
      async showEditDialog(attrId) {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
          params: {attr_sel: this.activeName}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('失败')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮修改参数
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if(!valid) return
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
          })
          if(res.meta.status !== 200) {
            return this.$message.error('失败')
          }
          this.$message.success('成功')
          this.getParamsData()
          this.editDialogVisible =false
        })
      },
      // 根据Id删除对应的参数项
      async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrId}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }

      this.$message.success('删除参数成功！')
      this.getParamsData()
      },
      // 文本框失去焦点或者按下enter都会触发
      async handleInputConfirm(row) {
        if(row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrValues(row)
      },
      showInput(row) {
        row.inputVisible = true
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      async saveAttrValues(row) {
        // 发起数据请求 把数据放到数据库中
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
      },
      // 删除对应的参数可选项
       handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrValues(row)
      }
    }
  }
</script>

<style scoped>
.el-card{
  height: 800px;
  overflow: scroll;
}
  .cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>